Chambered soaking pit



Oct- 23, 1951 H. SCHAEFER CHAMBERED SOAKING PIT Filed Feb. 4, 1949 s lf. /////V/ INNENTOR. HERBERT SCHAEFER ,l Il

Huf

ATTORNEY.

Patented Oct. 23, 1951 UNITED .STATES PATENT oFFlcE."

CHAMBERED SOAKING PIT Herbert Schaefer, Luxemburg, Luxemburg ci,

Application February 4, 1949, Serial No. 74,574 In Luxemburg June 21, 1948 4 Claims.

In the existing chambered furnaces in which the products to be heated are inserted through the top and which are adapted to reheat the air and the gas in continuous recuperators, the flame of the burners is projected horizontally into the chamber of the furnace above the products to be heated and travels towards the bottom 'where ii is exhausted through openings at the base of the side walls.

This produces a difference in the temperatures ofthe top and the bottom of the products to be heated'. Furthermore,V in order to prevent the top of the ingots from being overheated, they must be prevented from coming into direct contact with the llame issuing from the burners and sufficient space must be left above the ingots to serve as a combustion chamber for the flames in course of formation. It is therefore necessary to give the chamber a great depth, which is not always compatible with the arrangement of the premises.

' The present invention has for its object to obviate these drawbacksA by providing a, perfect circulation of the flames and a uniform temperature in the furnace owing to thev arrangement of the burner and the ues relatively to the chamber Yof the furnace.

The combustion chamber is located at one end of the furnace and is so shaped as to form an inclined cylindrical surface or an upwardly flooring conical surface. The exit flues are located at the bottom of the opposite wall near the level of the hearth. Thus the ames enter the furnace and the products of combustion quit the furnace in a close level to the hearth.

The combustion supporting agent and the fuel are conveyed to the base of said combustion chamber and the flame issues vertically from the bottom towards the top. It spreads out in fan shape along the cylindrical or conical Wall of said chamber and extends over the entire width of the furnace before coming into contact with the products to be heated.

The wall opposite the burner may be vertical or so shaped as to favour the return of a portion of the llames towards the burners so as to activate the natural circulation which is set up of its own accord by the location of the burner and the exit ilues and any difference of temperature so long as the temperature is notl uniform throughout the whole chamber of the furnace. The side walls of the chamber of the furnace may also be shaped so as to favour the circulation of the flames.

If it is desired to remove the slag which is formed at high temperature, an outflow opening may be provided at the base of the wall opposite the burners between two smoke flues. This wall of the furnace receives the radiation of the inclined surface of the combustion chamber and is continually licked by the flames. The slag 2 therefore remains very hot and can be removed without difficulty in a molten state. A

The smoke ues are located atthe base of the Wall opposite the burners. e

One embodiment of the present inventionis illustrated in Figs. 1, 2 and 3, which show an example of a furnace in which the air is re-heated in a recuperator through which the names issuing from the furnace are adapted to Dass.

Fig. 1 -is a section along the line A-B of Fig. 2. Fig. 2 is a plan view of the chamber of the fur-` nace and of the recuperator, with the cover 4and the accessory members such as the gas cock, the fan and the gas manifold removed. Y Fig. 3 is a section along the lineE-F of Fig. 2, showing the prole of the side walls. A

In Fig. 1 the gas is supplied through the mani--V fold I, the cock 2, the pipe 3, the` flue 4 and issues vertically into the chamber 5. The hot air fromthe recuperator is sucked by the fan 6 and driven through the' pipel and suitable devices into the chamber5 where it encounters the gas. I I

The'flame issues vertically into the chamber of the furnace 8, the wallV 9 of which is arranged so as to `form a cylindrical or conical surface. The

llame spreads against this wall and follows the path indicated by the arrows IIJ' I The chamber of the furnace is closed by the movable cover I I'. The wall I2 Opposite the burn-e ers may be vertical,v inclined, or of a suitable profile, such as is shown in Fig. 1, which favours the return of the'flames towards the bur-ner.v

Part of the names escapes/through the open-l ings I3 at the base of the wall I2, follows the flues I4 and reaches the distribution chamber I5 of the recuperator I6, whence it flows into the manifold I'l and then into the flues I8 connecte f to the chimney. Y l I Between` the two openings I3, a hole I9 isprovided for the outlet of the slag, which enables the same to be removed inthe molten state. The circulation of the flames in the direction of the arrows I0 is more active as the differencesof temperature between the top and the bottom' siderably reducing the losses of heat through the walls and also the cost of the plant.

There may be one or more smoke outlet open-A ings at the base of the wall opposite the burner; likewise severall burners may be provided at one end ofthe furnace according to the fuel em-v- The transverse section of the furnace- I claim:

1. A soaking pit furnace comprising a vheating chamber having 1an vopen roof fprgintroduction of the products to be heated, a iiat cover for said opening in the roof, a single combustion charnber located at one end of said heating chamber and opening freely into same throughout the.

major part of its height, the bottom of saidcombustion chamber being at substantially the same level as the hearth of the heating chamber and its rear wall assuming a sharp slope :extending substantially between the outer lower end of the bottom of the combustion chamber andv 'a' 'line near the roof of the heating chamber defining the upper-end :of the opening .between the. heating chamber and the combustion chamber., .a vertical well opening. into the outer 'end of the :bottom vof the combustion chamber, :means vfor, feeding/'air andrfuel. into thelower end of 'saidi vertical well the combustion of which will. .produce Verticall ames. which are adapted to sweep over 'the .rear Wall fof the .combustion chamber, to spreadv throughout the width thereof,Y to mix through induction with the combustion .products nea-r'the hearth, `toentcr theheating chamber tangentially with the cover thereof,y and to vreturn along a substantially closed, elliptical path towards vsaid combustion chamber, fand-exit nues opening into the-heating chamber jjustabovethe hearth thereof in the solid wall of the heating chamber op- PQSlte, the 'combustion chamber and through which Aa fraction of the gases conveyed Vioy the ames is exhausted. n

v l2. A soaking -pit fur-nace Acomprising a heating chamber having an open roof for introduction `of the products -to be heated, a ilat cover for said opening intheV roof, -a single combustion chamber .locatedfat one end of said heatingV chamber and opening freely into same throughout the major part Vof its height, .the Vbottom of said combustion chamber being .at substantially the same level as fthe-hearth of Vthe...hea-ting chamber and itsrear wall assuming a sharp slope extending substantially between the outerlower end of thek bottom ofthe combustion chamber and a linel near theA roof of the heating chamber defining the upper end of theopening between the heating chamber and 'combustion chamber, Aa vertical well opening `into the outer end Yof the bottom 'of the combustion chamber, means for .feeding l'air andfyuel into the lower end of saidver-tical well, the combustion of which will produce vertical ames'which are adapted to sweepover .the rear wall of vthe combustion chamber, to. spread.

throughout the width thereof, tomix 'through induction with the combustion products near the hearth, to enter theheating chamber tangentially with the -cover thereof andto return alongasubstantially closed elliptical path towardssaid-com-.-

bustion chamber, the solid wall of the heating chamberopposed to the combustion chamber being recessed towards the middle of its 4height to further the sweepingmovement ofthe flames oyer it, and exit :flues opening into'. the heating chamber viust above the hearth thereof inthe solid Wall of the-heating chamber .opposite the combustion chamber and .through which a frace. tion of the gases induced ,by tha-flames is vexhausted.

3.'.A soaking pit furnace comprising a heating chamber having anfopen roofA forintroduction of the products rto be. heated, a flat cover forfsa-id'opening in the roof., fa single cer-nbiastion chamber located at one end of said heatingchamber V:and :opening 'freely Same'fthreughout the major part of its height, the bottom-of said combustion chamber being at substantially .the same. level .as the .hearth .of the', heating .fchamberfandf itsL rear'.y wall assuming. a conical shape having its apex substantially above the -center of the opening in the roof and extending substantially between the outer lower end of the bottom of the combustion chamber and a line near the roof Vof the heating chamber defining 'the upper end of the opening between the two chambers, a. vertical. well opening into the outer l. en'd of the bottom of the combustion chamber,

means Ifor feeding air and fuel into the lower endo'f said vertical well; the combustion of which ,will produce vertical ameswhich are adapted to sweepfover the rear -wall of the combustion chamber, 'to'spread'throughout the width thereb'f., to mix through *induction with the combustion productsnear the hearth, to enter the heat- 'jing chamber tangentially with Vthe 'cover thereof 'andfto return. along 'a' substantially 'elliptical path towards said combustion chamber, and exit Vflues opening'into the heating chamber just above 'the hearth thereof .in the solid wall of the heating chamber Vopposite the combustion chamber and through 'which a fraction of the .gases induced -by the names exhausted.

4. A soaking pit furnace comprising a heating chamber 'having 'an open roof, Aa .flat cover Vfor. 'said 'opening inthe roof, a single combustion chamber located 'at one end Vof said heating chamber and opening Ifreely into the same throughout 4the major ,part of its height, `the bottom 'of said combustionchamberbeing atsubstantially the same level as the hearth of the heating chamber, and its rear wall assuming a conical .shape having its apex substantially above. the center of the opening fin the .roof and .extending substantially between the outer lower end o'f the 'bottom .of the .combustion chamber and a line near the roof of thehea't'ing chamber defining the upper endlof the opening..between the two chambers, .a vertical well opening into the outer endv of thebo't'tom of the combustionY chamber, lmeans [for .feeding air and fuel into the lower .endof said vertical well, the combustion of which is adapted to produce vertical flameswhich .are adapted tosweep -over `the. rear wall of the combustion chamber, tospread throughout theI width thereof, to .rn-ix Ythrough .inductioniwith they combustion products near the hearth, toer-iter .the heating chamber tangentially with 'the cover thereof, and to returnv .along a substantial-ly elliptical .pathl 'towards said: heatiing chamber, the side walls .of theheating chamber including a lower portion, land fexitl nues opening into the heating chamber just above .the hearth l thereofV in the .solid vwai-1Y -of the heating..,chamber opposite the combustion chamber and through, which aI fraction of the gasesl induced by thev flames is. .exhaustedv HERBERT scHAEFEa 'REFERENCES CITED 'The following .references are of record in .the 

